COMPUTATION OF 3-D CURRENT-DRIVEN EDDY-CURRENT PROBLEMS USING CUTTINGSURFACES

Since the traditional formulation in terms of a current vector potenti al T and a magnetic scalar potential psi enforces zero net current in conductors, they cannot be used to solve current driven eddy current p roblems, For this reason, an alternative using T-T-0-psi formulation w here T-0 described an arbitrary current distribution with the given ne t current in conductors has been proposed some years ago. In this pape r, an alternative finite element T-H-j-phi formulation using cutting s urfaces is proposed, A cutting surface describing the given net curren t in the conductor is introduced in the nonconducting multi-connected region in order to allow a discontinuity of the scalar potential. This method also avoids cancellation errors in permeable regions and ensur es a good numerical stability of the finite element scheme. The presen t method is validated with a 3-D current driven eddy current problem, Results are compared to T-T-0-psi formulation computation.